A Hybrid Supervisory Control System for Flexible Manufacturing Workeells
نویسندگان
چکیده
Because of their nondeterministic nature of behaviour, the supervisory control of manufacturing systems must be carried out in closed loop. This trait greatly increases the size and complexity of the Discrete-Event System (DES)-based supervisorycontrollers of manufacturing systems. In an attempt t o cope with this complexity, a Hybrid Supervisory Controller HSC) i s proposed. It splits pervisory controller, which contains the nominal control strategy, (ii) a diagnostic system, which monitors the workcell, and (iii) an Alternate Strategy Driver (ASD), that asserts control by revising the nominal strategy of the DES supervisory controller, whenever events diverge f rom the states of the DES supervisory controller. This modified approach to DES control provides a more eficient controller than could reasonably be attained using solely a DES supervisory controller. operations between its t x ree elements: ( a ) a DES su-
منابع مشابه
A hybrid algorithm optimization approach for machine loading problem in flexible manufacturing system
The production planning problem of flexible manufacturing system (FMS) concerns with decisions that have to be made before an FMS begins to produce parts according to a given production plan during an upcoming planning horizon. The main aspect of production planning deals with machine loading problem in which selection of a subset of jobs to be manufactured and assignment of their operations to...
متن کاملA HYBRID GENETIC ALGORITHM FOR A BI-OBJECTIVE SCHEDULING PROBLEM IN A FLEXIBLE MANUFACTURING CELL
This paper considers a bi-objective scheduling problem in a flexible manufacturing cell (FMC) which minimizes the maximum completion time (i.e., makespan) and maximum tardiness simultaneously. A new mathematical model is considered to reflect all aspect of the manufacturing cell. This type of scheduling problem is known to be NP-hard. To cope with the complexity of such a hard problem, a genet...
متن کاملNonblocking Supervisory Control of Flexible Manufacturing Systems based on State Tree Structures
Much research has been addressed to nonblocking supervisory control of Discrete-Event Systems (DES) such as Flexible Manufacturing Systems (FMS), and a variety of approaches have been developed. One especially powerful approach, due to Chuan Ma, is based on DES representation by means of State Tree Structures (STS). Using STS, this chapter develops nonblocking supervisory control of a well-know...
متن کاملEstablishing Information Requirements for Supervisory Controllers in a Flexible Manufacturing System Using GTA
In this article we consider the technological change that has occurred in complex manufacturing systems within the past two decades and the implications it has had on the role of human operators in manufacturing systems control. Our examination ranges from the traditional production line manned by skilled machinists to flexible manufacturing systems (FMS) under supervisory control. On the basis...
متن کاملHybrid Concepts of the Control and Anti-Control of Flexible Joint Manipulator
This paper presents a Gaussian radial basis function neural network based on sliding mode control for trajectory tracking and vibration control of a flexible joint manipulator. To study the effectiveness of the controllers, designed controller is developed for tip angular position control of a flexible joint manipulator. The adaptation laws of designed controller are obtained based on sliding m...
متن کامل